Dry and pullman car wheel works



(No Model.) I J. McDOWELL.

BENDING MACHINE.

N0 ..2 53,934. Patented Feb. 21,1882.

Witnesses. I Inventor.

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UNITED STATES PATENT OFFICE.

JOHN'MGDOWELL, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE UNION FOUN- DRY AND PULLMAN OAR WHEEL WORKS, OF SAME PLACE.

BENDl NG-MACHINE.

SPECIFICATION formingpart of Letters Patent No. 253,934, dated February 21, 1882,

Application filed November 4, 1881. (No model.)

To all whom it may concern Be it known that I, JOHN MCDOWELL, of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Bending-Machines, which improvement is fully set forth in the following specification and accompanying drawings.

My invention relates to improvements in bending-machines in which bar-iron shapes of irregular curves are bent; and the object of my invention is to form such bar-iron shapes in a cheaper manner than heretofore and of exact duplication one with another.

My invention consists, first, in a machine for bending bars to irregular form, the combination of an anti-friction roller, which, by a yield-' ing pressure against the bar, shall shape it to the form of the pattern, with a rotating pattern-die of irregular form, and with the specified construction of parts connected therewith, substantially as hereinafter shown and claimed; and, second, in bending-dies of the construction herein shown for bending such irregular curved form shapes, all substantially as herein after shown.

Referring to the drawings, like letters refer to like parts, in which- Figure 1 is an elevation of the machine, partlyin section, and with portions of theframe broken away. Fig. 2 is a top View of the machine. Figs. 3 and 4. are detail views of the dies A and B.

The table 0 and its legs D constitute the frame of the machine. In the table 0 is a circular opening, in which is loosely seated arevolving bed, E, to which the dies A B are attached, as will be understood by the drawings.

a is a crown-wheel of bevel-gear bolted to the under side of thebed E, and b is a pinion driving the crown-wheel, causing the bed E to rotate. c is a belt-pulley by which power is applied. d is a clutch used to stop and start the revolving bed. The pulley c, clutch d, and the pinion b are all attached to the same shaft, as shown.

A B are the bending-dies, made in parts,

- consisting of the parts A and B, of like size and shape, with a part, c, of smaller size interposed between them, whereby a recess or groove is formed, the part eformin g the bottom of the recess or groove, as will be understood by inspecting the drawings. The part A and part e are made solid, preferably cast in one piece,

with'the post f extending through a perforation in the part B, and a key, g, put through the post above the part B, securing the parts A B rigidly together, as shown in the drawings. The dies A B are of an irregular outline form, having straight sections and segment-curved sections, as shown in the drawings.

F is a fixed pulley suspended above the machine. h is a dead-weight or counter-balance, connected by the rope or chain to the die B, by which the die B is lifted above the dieA on removing the key 9, as shown in Fig. 3. j and k are guide-rollers between which the bar to be bent passes, as shown in Fig. 2, and lis the bar of iron being bent around the dies.

1) is an oscillating roller mounted on the end of the sliding bed q, having a rack, 4, into which the pinion R is geared. The pinion R is seated on a shaft, which carries the lever L, on which there is a weight, M, as shown in th drawings.

W is a steam-cylinder, with a piston y and a piston-rod, z. The cylinderis attached to the end of the frame O, and the piston-rod is connected at 0 with the sliding bed, as shown in Fig. 1.

In operation the dies Aand B are caused to rotate, and the bar Z, properly heated, is placed between the guide-rollers j and 7c and one end of the bar securely held to the dies by a clamp, and as the dies rotate the bar will be drawn in around the dies. The oscillating roller 10 has a power-forced bearing on the outside of the bar I, which drives the bar into all the irregular curves of the pattern-die, the weight M or steam applied in the cylinder acting with force to drive the roller p into all the irregular curves in bending.

Having thus set forth my invention, whatI claim, and desire to secure by Letters Patent, 1s-=- 1. In a machine for bending bars to irregu lar form, a table having an opening inits top, a revolving bed loosely seated in said opening, with pattern-dies of irregular form attached to said bed and rotating therewith, substantially as shown, in combination with an antifriction roller which, by a yielding pressure against the bar, shall shape it to the form of the pattern, substantially as and for the purpose set forth.

2.- In a bending-machine, the dies A B, constructerl in parts, the part A constructed with an ofiset or smaller sectional part, e, whereby E. I HURLBUT,

Rom. VIERLING. 

